domain native and operational policies support

- moved DomainMaker to policy-utils/ project.
- support for native drools and controller drools policy types.

Issue-ID: POLICY-2345
Signed-off-by: jhh <jorge.hernandez-herrero@att.com>
Change-Id: I46b9816eadceb7ef280e0e6789f07b4d4ca51519
Signed-off-by: jhh <jorge.hernandez-herrero@att.com>

1 files changed, 233 insertions, 0 deletions

diff --git a/policy-utils/src/main/java/org/onap/policy/drools/policies/DomainMaker.java b/policy-utils/src/main/java/org/onap/policy/drools/policies/DomainMaker.java
new file mode 100644
index 00000000..6e1e0881
--- /dev/null
+++ b/policy-utils/src/main/java/org/onap/policy/drools/policies/DomainMaker.java
@@ -0,0 +1,233 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.drools.policies;
+
+import com.worldturner.medeia.api.ValidationFailedException;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import lombok.NoArgsConstructor;
+import lombok.NonNull;
+import org.apache.commons.lang3.StringUtils;
+import org.onap.policy.common.utils.coder.CoderException;
+import org.onap.policy.common.utils.coder.StandardCoder;
+import org.onap.policy.common.utils.coder.StandardValCoder;
+import org.onap.policy.common.utils.resources.ResourceUtils;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyType;
+import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicyTypeIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Converts Tosca Policies into Domain policies.
+ *
+ * <p>
+ * A Domain Policy is a specialized version of the Tosca Policy that
+ * conform with a particular domain specification in json schema format.
+ * A ToscaPolicy is a generic data structure where domain data is contained
+ * in a Map[String, Object]. This class contains that generic information
+ * into a concrete domain specific data model for the ToscaPolicy.
+ * </p>
+ */
+
+@NoArgsConstructor
+public class DomainMaker {
+
+    private static final Logger logger = LoggerFactory.getLogger(DomainMaker.class);
+
+    /**
+     * policy-type -> schema validator map.
+     */
+    private final Map<ToscaPolicyTypeIdentifier, StandardValCoder> validators = new ConcurrentHashMap<>();
+
+    /**
+     * non-validation serialization coder.
+     */
+    private final StandardCoder nonValCoder = new StandardCoder();
+
+    /**
+     * Does this json conform to a registered policy type schema?.
+     */
+    public boolean isConformant(@NonNull ToscaPolicyTypeIdentifier policyType, @NonNull String json) {
+        if (!isRegistered(policyType)) {
+            return false;
+        }
+
+        return validators.get(policyType).isConformant(json);
+    }
+
+    /**
+     * Does this policy conform to its domain specification?.
+     */
+    public boolean isConformant(@NonNull ToscaPolicy policy) {
+        String rawPolicy = serialize(policy);
+        if (StringUtils.isBlank(rawPolicy)) {
+            return false;
+        }
+
+        return isConformant(policy.getTypeIdentifier(), rawPolicy);
+    }
+
+    /**
+     * Does this domain policy conforms to its schema definition?.
+     */
+    public <T> boolean isDomainConformant(@NonNull ToscaPolicyTypeIdentifier policyType, @NonNull T domainPolicy) {
+        if (!isRegistered(policyType)) {
+            return false;
+        }
+
+        try {
+            return validators.get(policyType).encode(domainPolicy) != null;
+        } catch (CoderException e) {
+            logger.info("policy {}:{} is not conformant", policyType, domainPolicy.getClass().getName(), e);
+            return false;
+        }
+    }
+
+    /**
+     * Check policy conformance to its specification providing a list of errors
+     * in a ValidationFailedException.
+     */
+    public boolean conformance(@NonNull ToscaPolicy policy) throws ValidationFailedException {
+        if (!isRegistered(policy.getTypeIdentifier())) {
+            return false;
+        }
+
+        String rawPolicy = serialize(policy);
+        if (StringUtils.isBlank(rawPolicy)) {
+            return false;
+        }
+
+        try {
+            validators.get(policy.getTypeIdentifier()).conformance(rawPolicy);
+        } catch (CoderException e) {
+            logger.info("policy {}:{}:{} is not conformant",
+                    policy.getTypeIdentifier(), policy.getName(), policy.getVersion(), e);
+            if (e.getCause() instanceof ValidationFailedException) {
+                throw (ValidationFailedException) e.getCause();
+            }
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Checks a domain policy conformance to its specification providing a list of errors
+     * in a ValidationFailedException.
+     */
+    public <T> boolean conformance(@NonNull ToscaPolicyTypeIdentifier policyType, T domainPolicy)
+        throws ValidationFailedException {
+
+        if (!isRegistered(policyType)) {
+            return false;
+        }
+
+        try {
+            validators.get(policyType).encode(domainPolicy);
+        } catch (CoderException e) {
+            logger.info("policy {}:{}:{} is not conformant", policyType, domainPolicy.getClass().getName(), e);
+            if (e.getCause() instanceof ValidationFailedException) {
+                throw (ValidationFailedException) e.getCause();
+            }
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Registers a known schema resource for validation.
+     */
+    public boolean registerValidator(@NonNull ToscaPolicyTypeIdentifier policyType) {
+        //
+        // A known schema is an schema embedded in a .jar in the classpath under the schemas/
+        // resource directory matching the following syntax: schemas/<policy-type>.schema.json.
+        //
+        String schema =
+                ResourceUtils
+                        .getResourceAsString("schemas/"
+                            + policyType.getName() + "-" + policyType.getVersion() + ".schema.json");
+        if (schema == null) {
+            return false;
+        }
+
+        return registerValidator(policyType, schema);
+    }
+
+    /**
+     * Registers/Overrides a new/known schema for a policy type.
+     */
+    public boolean registerValidator(@NonNull ToscaPolicyTypeIdentifier policyType, @NonNull String schema) {
+        try {
+            validators.put(policyType, new StandardValCoder(schema, policyType.toString()));
+        } catch (RuntimeException r) {
+            logger.info("schema for {} is not valid", policyType, r);
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Converts a ToscaPolicy into a Domain Policy.
+     */
+    public <T> T convertTo(@NonNull ToscaPolicy toscaPolicy, @NonNull Class<T> clazz) throws CoderException {
+        return convertTo(toscaPolicy.getTypeIdentifier(), nonValCoder.encode(toscaPolicy), clazz);
+    }
+
+    /**
+     * Converts a JSON policy into a Domain Policy.
+     */
+    public <T> T convertTo(@NonNull ToscaPolicyTypeIdentifier policyType, @NonNull String json, @NonNull Class<T> clazz)
+            throws CoderException {
+        if (isRegistered(policyType)) {
+            return validators.get(policyType).decode(json, clazz);
+        } else {
+            return nonValCoder.decode(json, clazz);
+        }
+    }
+
+    /**
+     * Converts a Tosca Policy Type specification to a domain-specific json specification.
+     */
+    public String convertToSchema(@NonNull ToscaPolicyType policyType) {
+        //
+        // TODO:
+        // 1. Convert Tosca Policy Type definition schema to suitable json schema.
+        // 2. Call registerValidator to register
+        throw new UnsupportedOperationException("schema generation from policy type is not supported");
+    }
+
+    public boolean isRegistered(@NonNull ToscaPolicyTypeIdentifier policyType) {
+        return validators.containsKey(policyType) || registerValidator(policyType);
+    }
+
+
+    private String serialize(@NonNull ToscaPolicy policy) {
+        String rawPolicy = null;
+        try {
+            rawPolicy = nonValCoder.encode(policy);
+        } catch (CoderException e) {
+            logger.debug("policy {}:{} is invalid json", policy.getTypeIdentifier(), policy.getIdentifier(), e);
+        }
+        return rawPolicy;
+    }
+}